EP0376595A3 - Method and document scanner for providing contrast/intensity control - Google Patents

Method and document scanner for providing contrast/intensity control Download PDF

Info

Publication number
EP0376595A3
EP0376595A3 EP19890313318 EP89313318A EP0376595A3 EP 0376595 A3 EP0376595 A3 EP 0376595A3 EP 19890313318 EP19890313318 EP 19890313318 EP 89313318 A EP89313318 A EP 89313318A EP 0376595 A3 EP0376595 A3 EP 0376595A3
Authority
EP
European Patent Office
Prior art keywords
contrast
word
document
pel
intensity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19890313318
Other languages
German (de)
French (fr)
Other versions
EP0376595B1 (en
EP0376595A2 (en
Inventor
Dan Leany Dalton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0376595A2 publication Critical patent/EP0376595A2/en
Publication of EP0376595A3 publication Critical patent/EP0376595A3/en
Application granted granted Critical
Publication of EP0376595B1 publication Critical patent/EP0376595B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

A document scanner (10) generates an 8-bit binary scan word (30) for each picture element (PEL) of a document (11). An intensity and/or contrast look-up table memory element (40), or a computation means (47) is addressed using the scan words. The stored content of each storage location in the look-up table memory element, or the value that is computed by the computation means, comprises an enhanced 8-bit binary word (44) that varies as a function of user selected image intensity (48) and/or contrast (49) enhancement. In this way, each document PEL scan word produces its intensity and/or contrast enhanced equivalent PEL word.
EP89313318A 1988-12-28 1989-12-20 Method and document scanner for providing contrast/intensity control Expired - Lifetime EP0376595B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/290,773 US4937682A (en) 1988-12-28 1988-12-28 Method and apparatus for providing contrast/intensity control in a document scanner
US290773 1988-12-28

Publications (3)

Publication Number Publication Date
EP0376595A2 EP0376595A2 (en) 1990-07-04
EP0376595A3 true EP0376595A3 (en) 1991-09-04
EP0376595B1 EP0376595B1 (en) 1995-06-21

Family

ID=23117496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89313318A Expired - Lifetime EP0376595B1 (en) 1988-12-28 1989-12-20 Method and document scanner for providing contrast/intensity control

Country Status (4)

Country Link
US (1) US4937682A (en)
EP (1) EP0376595B1 (en)
JP (1) JP2937372B2 (en)
DE (1) DE68923164T2 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02250464A (en) * 1989-03-24 1990-10-08 Sharp Corp Facsimile equipment
US5046118A (en) * 1990-02-06 1991-09-03 Eastman Kodak Company Tone-scale generation method and apparatus for digital x-ray images
EP0553286A4 (en) * 1990-10-15 1993-11-03 The Gerber Scientific Instrument Company A large area digital scanner
EP0514504B1 (en) * 1990-11-21 1997-04-23 Polaroid Corporation Printing method
US5170261A (en) * 1990-11-21 1992-12-08 Polaroid Corporation Printing method
US5359432A (en) * 1991-11-25 1994-10-25 Lexmark International, Inc. Printer page composition with color and text
FR2695282B1 (en) * 1992-09-01 1994-10-14 Gen Electric Cgr Contrast adjustment method.
IL106691A (en) * 1993-08-13 1998-02-08 Sophis View Tech Ltd System and method for diagnosis of living tissue diseases
EP0811205B1 (en) * 1994-11-25 2003-09-10 Sophisview Technologies, Ltd System and method for diagnosis of living tissue diseases
US5719965A (en) * 1994-12-13 1998-02-17 Hewlett-Packard Company Higher precision look-up table from lower precision look-up table for improved tonal adjustment
GB2336931A (en) * 1998-04-29 1999-11-03 Sharp Kk Temporal dither addressing scheme for light modulating devices
US6385346B1 (en) 1998-08-04 2002-05-07 Sharp Laboratories Of America, Inc. Method of display and control of adjustable parameters for a digital scanner device
KR100314097B1 (en) * 1999-10-08 2001-11-26 윤종용 Method and apparatus for generating white component and for controlling the brightness in display devices
JP2006262344A (en) * 2005-03-18 2006-09-28 Toshiba Corp Image forming apparatus and method
JP4940585B2 (en) * 2005-07-04 2012-05-30 富士ゼロックス株式会社 Image processing apparatus and method
US7599556B2 (en) * 2005-08-25 2009-10-06 Joseph Stanley Czyszczewski Apparatus, system, and method for scanning segmentation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271436A (en) * 1978-05-02 1981-06-02 Ricoh Co., Ltd. Digital copying machine
EP0095716A2 (en) * 1982-05-28 1983-12-07 Linotype-Paul Limited Mapping ram for a modulated display
EP0110185A1 (en) * 1982-11-04 1984-06-13 Fuji Photo Film Co., Ltd. Gradation correction curve creating method and apparatus
EP0175285A2 (en) * 1984-09-12 1986-03-26 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus and reproduction condition designating apparatus
EP0235042A1 (en) * 1986-02-28 1987-09-02 General Electric Cgr S.A. Digital image system with gray scale control, especially to visualize blood veins

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129853A (en) * 1977-09-26 1978-12-12 International Business Machines Corporation Method and apparatus for producing compensated signals for individual light sensors arranged in a predetermined relation
EP0031247B1 (en) * 1979-12-20 1984-03-14 Cambridge Consultants Limited Apparatus and method for generating a dispersed dot half tone picture from a continuous tone picture
JPS59125176A (en) * 1982-12-30 1984-07-19 インタ−ナシヨナル　ビジネス　マシ−ンズ　コ−ポレ−シヨン Device for correcting ageing effect in video image
JPH0757007B2 (en) * 1984-01-23 1995-06-14 株式会社ニコン Image reader
US4636845A (en) * 1985-05-06 1987-01-13 Eastman Kodak Company Digital image processing method for over and under exposed photographic images
EP0254235B1 (en) * 1986-07-18 1992-04-29 Dainippon Screen Mfg. Co., Ltd. Image data processing method and apparatus therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271436A (en) * 1978-05-02 1981-06-02 Ricoh Co., Ltd. Digital copying machine
EP0095716A2 (en) * 1982-05-28 1983-12-07 Linotype-Paul Limited Mapping ram for a modulated display
EP0110185A1 (en) * 1982-11-04 1984-06-13 Fuji Photo Film Co., Ltd. Gradation correction curve creating method and apparatus
EP0175285A2 (en) * 1984-09-12 1986-03-26 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus and reproduction condition designating apparatus
EP0235042A1 (en) * 1986-02-28 1987-09-02 General Electric Cgr S.A. Digital image system with gray scale control, especially to visualize blood veins

Also Published As

Publication number Publication date
US4937682A (en) 1990-06-26
DE68923164T2 (en) 1995-10-26
JP2937372B2 (en) 1999-08-23
EP0376595B1 (en) 1995-06-21
DE68923164D1 (en) 1995-07-27
EP0376595A2 (en) 1990-07-04
JPH02213985A (en) 1990-08-27

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